吉南老岭成矿带荒沟山、板庙子金矿床地质特征与成因

以吉林东南部老岭成矿带中较具规模的荒沟山、板庙子金矿床为代表,对矿床地质特征进行对比,认为区内太古界表壳岩、晚元古界老岭群为主要矿源层,北东向深大断裂带为主要控矿构造,空间上金矿体的分布与岩浆岩关系不密切。结合区内成矿地质条件及成矿物质来源分析,认为金矿床形成于中低温热液环境,深部流体、岩浆热液及大气降水作为成矿流体共同参与了成矿作用,以大气降水为主,构成大气降水—深源热液循环成矿系统。老岭金及多金属成矿带具有较大的成矿潜力和良好的找矿远景,区内金矿的分布主要与大型断裂带相关联的珍珠门组大理岩上部不整合有关。

Geological characteristics and genesis of Huanggoushan and Banmiaozi gold deposits in Laoling metallogenic belt of southern Jilin

Through the comparison of geological characteristics of Huanggoushan and Banmiaozi gold deposits in Laoling metallogenic belt of southeastern Jilin,the authors considered that Archen supracrustal rock and the Late Proterozoic Laoling Group are main source beds,and the northeastern deep fault belt is the main ore-controlling structure;while the distributions of gold orebody do not closely related to the magmatic rock in spatial.The gold deposit was formed in low-medium temperature hydrothermal environment,combining with the analysis of geological conditions and material sources of mineralization.Deep fluid,magmatic hydrothermal and meteoric water all joined in the mineralization dominated by meteoric water,and formed the circulation mineralization system of meteoric water and deep hydrothermal.Laoling gold and polymetallic metallogenic belt has great metallogenic potential and favorable prospecting potential.The distributions of gold deposit were related to the unconformity on upper marble of Zhenzhumen Formation which related with large fault zones.